[RFI] I. C. E. products question

Juan EA5RS ea5rs at ono.com
Tue Jan 1 19:49:52 EST 2008

I have recently measured a couple of ICEs419 (6 band switched BPF) and a
Dunestar600 (similar to the 419) with an accurrate Vector Network Analyzer.

While frequency response is similar between both models on the lower bands,
the Dunestar is significantly sharper and has a higher ultimate rejection
(although not spectacular) on 20, 15 and 10m, at the expense of roughly 0,1
to 0,2 dB additional insertion loss vs the 419. 

I chose the Dunestar for my application (SO2R-M/S).

I also have a single-band 160m W3NQN BPF which outperforms both the ICE and
the Dunestar in terms of insertion loss and selectivity

I have the data if someone is interested.

73 Juan EA5RS

-----Mensaje original-----
De: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] En nombre
de Jim Brown
Enviado el: lunes, 31 de diciembre de 2007 18:43
Para: rfi at contesting.com
Asunto: Re: [RFI] I. C. E. products question

I'm a member of NCCC, the Northern California Contest Club. A question was 
recently asked on our reflector about the merits of various BPF filter 
sets. ICE RF bandpass filters are fairly well regarded -- not nearly as 
good as the W3NQN filters, but better than Dunestar. The W3NQN filters are 
significantly better design (more poles), and thus more expensive. I own 
seven ICE filters. Two were bought at hamfests, the others direct. QC, 
however, is not so good. Of those bought direct, three were out of 
alignment and needed to be returned for retuning (as measured on my HP 
gear). Factory service was good, fast, and courteous. 

The ICE filters are 150 watt filters. If you run more power through them, 
and/or if you run them with a serious mismatch, you are VERY likely to fry 
some capacitors. Most of the better power amps will hit full power with 50 
watts drive. These filters between the radio and the amp should hold up 
just fine. According to reports, the NQN filters have something on the 
order of 20 dB more attenuation. Ya pays yer money, and ya takes yer 


Jim Brown K9YC

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